I did a backup with rom manager Im not sure if thats what youre talking about. I did download titanium and backed up my apps.

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As long as you have a nandroid backup (made through recovery or rom manager) you should be fine. Just make sure you wipe properly before flashing (wipe data/factory reset, cache and dalvik cache. Optionally, format system, data and cache. I would also suggest getting comfortable with recovery and not just trusting rom manager to do everything for you.